C#实现3D效果完整实例

本文实例讲述了c#实现3d效果的方法。分享给大家供大家参考，具体如下：

一、新建一类文件

private static double[] addvector(double[] a, double[] b)
{
    return new double[] { a[0] + b[0], a[1] + b[1], a[2] + b[2] };
}
private static double[] scalarproduct(double[] vector, double scalar)
{
    return new double[] { vector[0] * scalar, vector[1] * scalar, vector[2] * scalar };
}
private static double dotproduct(double[] a, double[] b)
{
    return a[0] * b[0] + a[1] * b[1] + a[2] * b[2];
}
private static double norm(double[] vector)
{
    return math.sqrt(dotproduct(vector, vector));
}
private static double[] normalize(double[] vector)
{
    return scalarproduct(vector, 1.0 / norm(vector));
}
private static double[] crossproduct(double[] a, double[] b)
{
    return new double[] 
        { 
          (a[1] * b[2] - a[2] * b[1]), 
          (a[2] * b[0] - a[0] * b[2]), 
          (a[0] * b[1] - a[1] * b[0]) 
        };
}
private static double[] vectorproductindexed(double[] v, double[] m, int i)
{
    return new double[]
        {
          v[i + 0] * m[0] + v[i + 1] * m[4] + v[i + 2] * m[8] + v[i + 3] * m[12],
          v[i + 0] * m[1] + v[i + 1] * m[5] + v[i + 2] * m[9] + v[i + 3] * m[13],
          v[i + 0] * m[2] + v[i + 1] * m[6] + v[i + 2] * m[10]+ v[i + 3] * m[14],
          v[i + 0] * m[3] + v[i + 1] * m[7] + v[i + 2] * m[11]+ v[i + 3] * m[15]
        };
}
private static double[] vectorproduct(double[] v, double[] m)
{
    return vectorproductindexed(v, m, 0);
}
private static double[] matrixproduct(double[] a, double[] b)
{
    double[] o1 = vectorproductindexed(a, b, 0);
    double[] o2 = vectorproductindexed(a, b, 4);
    double[] o3 = vectorproductindexed(a, b, 8);
    double[] o4 = vectorproductindexed(a, b, 12);
    return new double[]
        {
          o1[0], o1[1], o1[2], o1[3],
          o2[0], o2[1], o2[2], o2[3],
          o3[0], o3[1], o3[2], o3[3],
          o4[0], o4[1], o4[2], o4[3]
        };
}
private static double[] cameratransform(double[] c, double[] a)
{
    double[] w = normalize(addvector(c, scalarproduct(a, -1)));
    double[] y = new double[] { 0, 1, 0 };
    double[] u = normalize(crossproduct(y, w));
    double[] v = crossproduct(w, u);
    double[] t = scalarproduct(c, -1);
    return new double[]
        {
          u[0], v[0], w[0], 0,
          u[1], v[1], w[1], 0,
          u[2], v[2], w[2], 0,
          dotproduct(u, t), dotproduct(v, t), dotproduct(w, t), 1
        };
}
private static double[] viewingtransform(double fov, double n, double f)
{
    fov *= (math.pi / 180);
    double cot = 1.0 / math.tan(fov / 2);
    return new double[] { cot, 0, 0, 0, 0, cot, 0, 0, 0, 0, (f + n) / (f - n), -1, 0, 0, 2 * f * n / (f - n), 0 };
}
public static image generate(string captchatext)
{
    int fontsize = 24;
    font font = new font("arial", fontsize);
    sizef sizef;
    using (graphics g = graphics.fromimage(new bitmap(1, 1)))
    {
      sizef = g.measurestring(captchatext, font, 0, stringformat.genericdefault);
    }
    int image2d_x = (int)sizef.width;
    int image2d_y = (int)(fontsize * 1.3);
    bitmap image2d = new bitmap(image2d_x, image2d_y);
    color black = color.black;
    color white = color.white;
    using (graphics g = graphics.fromimage(image2d))
    {
      g.clear(black);
      g.drawstring(captchatext, font, brushes.white, 0, 0);
    }
    random rnd = new random();
    double[] t = cameratransform(new double[] { rnd.next(-90, 90), -200, rnd.next(150, 250) }, new double[] { 0, 0, 0 });
    t = matrixproduct(t, viewingtransform(60, 300, 3000));
    double[][] coord = new double[image2d_x * image2d_y][];
    int count = 0;
    for (int y = 0; y < image2d_y; y += 2)
    {
      for (int x = 0; x < image2d_x; x++)
      {
        int xc = x - image2d_x / 2;
        int zc = y - image2d_y / 2;
        double yc = -(double)(image2d.getpixel(x, y).toargb() & 0xff) / 256 * 4;
        double[] xyz = new double[] { xc, yc, zc, 1 };
        xyz = vectorproduct(xyz, t);
        coord[count] = xyz;
        count++;
      }
    }
    int image3d_x = 256;
    int image3d_y = image3d_x * 9 / 16;
    bitmap image3d = new bitmap(image3d_x, image3d_y);
    color fgcolor = color.white;
    color bgcolor = color.black;
    using (graphics g = graphics.fromimage(image3d))
    {
      g.clear(bgcolor);
      count = 0;
      double scale = 1.75 - (double)image2d_x / 400;
      for (int y = 0; y < image2d_y; y += 2)
      {
        for (int x = 0; x < image2d_x; x++)
        {
          if (x > 0)
          {
            double x0 = coord[count - 1][0] * scale + image3d_x / 2;
            double y0 = coord[count - 1][1] * scale + image3d_y / 2;
            double x1 = coord[count][0] * scale + image3d_x / 2;
            double y1 = coord[count][1] * scale + image3d_y / 2;
            g.drawline(new pen(fgcolor), (float)x0, (float)y0, (float)x1, (float)y1);
          }
          count++;
        }
      }
    }
    return image3d;
}

注意引用命名空间：

using system.drawing;

二、页面调用

response.contenttype = "image/pjpeg";
captcha.generate("我就是3d内容").save(response.outputstream, system.drawing.imaging.imageformat.jpeg);

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希望本文所述对大家c#程序设计有所帮助。